High-temperature steam waste heat utilization mechanism on paperboard production line

Abstract

The high-temperature steam waste heat utilization mechanism on the paperboard production line comprises a spray cooling device, a wind power heat exchange device and a steam inlet pipeline, the wind power heat exchange device is connected to the right side of the steam inlet pipeline through a pipeline, and the spray cooling device is connected to the right side of the wind power heat exchange device through a pipeline; the spray cooling device further comprises a device body, a water inlet pipeline and a water outlet system; the wind power heat exchange device further comprises an air inlet pipeline, a heat exchanger, an air box and a steam connecting pipeline. The device has the functions of automatically adjusting the water temperature, distributing warm water and conveying the warm water into water equipment in time, a wind power heat exchange device is additionally arranged, the step of waste heat recovery is increased, the flow of steam waste heat is shared, and meanwhile the waste heat recovery efficiency of the device is improved; condensate water and steam are treated separately, so that the working efficiency of the device is improved; the temperature difference between cooling water and steam in the two heat exchange steps is increased, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat recovery technology, and in particular relates to a high-temperature steam waste heat utilization mechanism on a cardboard production line. Background Technology

[0002] A large amount of steam is used on the cardboard production line. After use, the steam is usually discharged directly, resulting in the waste of residual heat in the steam.

[0003] In the prior art, such as the steam waste heat recovery device disclosed in Chinese Patent (CN207197293U) for a cardboard production line, a branch pipe of the hot steam exhaust pipe extends vertically into the tank from the bottom of the tank. A coil is provided above the branch pipe, and multiple rows of water spray pipes are provided above the coil. A conical condenser hood is also provided above the water spray pipes. An exhaust pipe is provided at the top of the tank. This utility model provides a device that can recover waste heat from the steam generated on the cardboard production line. The steam with waste heat is introduced into the tank from the bottom, and cold water is sprayed down through the water spray pipes for direct contact heat exchange. The warm water that has absorbed some heat and accumulated at the bottom of the tank is reintroduced into the coil for heat exchange. This maximizes the collection and utilization of the waste heat of the steam by the circulating water, which can be used to produce hot steam again, which helps to save energy, protect the environment, and reduce production costs.

[0004] In summary: 1. This device uses waste steam heat to heat circulating water to achieve waste heat recovery. However, in actual production, the amount of steam produced for cardboard is much greater than the supply of circulating water. This results in a large amount of circulating water accumulating in the pipes and water tanks after the waste heat is recovered, leading to heat waste. 2. The recovered steam contains high-temperature condensate. Without separation and recovery of steam and condensate, it accumulates at the bottom of the pipes before entering the recovery tank, resulting in heat waste in the condensate and reduced efficiency of the recovery device. 3. The temperature of the warm water after condensation is higher than that before condensation. This further reduces the temperature difference between the warm water and the released steam, resulting in lower heat exchange efficiency through the coil. Consequently, the remaining heat in the steam cannot be fully recovered, leading to reduced thermal efficiency of the device.

[0005] Therefore, this paper provides a high-temperature steam waste heat utilization mechanism for a cardboard production line. Utility Model Content

[0006] To address the aforementioned technical problems, this utility model discloses a high-temperature steam waste heat recovery mechanism for a cardboard production line. This mechanism can automatically adjust water temperature, distribute warm water, and promptly deliver the warm water to the water-using equipment. It also incorporates a wind-powered heat exchange device to increase the waste heat recovery step, thus sharing the flow rate of recovered steam waste heat while improving the device's waste heat recovery efficiency. Separating condensate and steam treatment improves the device's operating efficiency. Furthermore, it increases the temperature difference between cooling water and steam in the two heat exchange steps, thereby improving heat exchange efficiency.

[0007] To achieve the above-mentioned technical effects, this utility model provides a high-temperature steam waste heat utilization mechanism for a cardboard production line, including a spray cooling device, a wind-powered heat exchange device, and a steam inlet pipe. The wind-powered heat exchange device is connected to the right side of the steam inlet pipe via a pipe, and the spray cooling device is connected to the right side of the wind-powered heat exchange device via a pipe. The spray cooling device also includes a device body, a water inlet pipe, and a water outlet system. The water inlet pipe is located on the left side of the device body, and the water outlet system is located on the right side of the device body. The wind-powered heat exchange device also includes an air inlet pipe, a heat exchanger, a wind box, and a steam connection pipe. The heat exchanger is connected to the right side of the steam inlet pipe via a pipe, the air inlet pipe is located behind the heat exchanger, the wind box is connected to the front side of the heat exchanger via a pipe, and the steam connection pipe is located between the right outlet of the heat exchanger and the left inlet of the spray cooling device, with the steam connection pipe inclined to the right.

[0008] Preferably, a perforated flow divider is provided between the heat exchange coil inside the device body and the inlet of the steam connection pipe.

[0009] Preferably, the water inlet pipeline further includes water inlet pipe a and water inlet pipe b. Water inlet pipe a is located on the left side of the device body and is connected to the inlet of the heat exchange coil in the device body. Water inlet pipe b is located above the device body and is connected to the inlet of the spray mechanism in the device body.

[0010] Preferably, the water outlet system further includes outlet pipe a, outlet pipe b, water pump, level gauge a, insulated water tank, temperature sensor, level gauge b, electric valve a, and electric valve b. The insulated water tank is located on the right side of the spray cooling device. Outlet pipe a is located between the right outlet of the heat exchange coil of the device body and the left inlet of the insulated water tank. Outlet pipe b is located between the lower right outlet of the device body and the left inlet of the insulated water tank. The water pump is located on the outlet pipe b. Level gauge a is located on the lower front side of the device body. The temperature sensor is located on the front side of the insulated water tank. Level gauge b is located to the right of the temperature sensor. Electric valve a is located on the left side of the water pump. Electric valve b is located on the outlet pipe b. The temperature sensor, level gauge a, level gauge b, electric valve a, and electric valve b are all electrically connected to the control room of the production workshop.

[0011] Preferably, the insulated water tank is provided with a water supply pipe a and a water supply pipe b on the right side, with water supply pipe a located on the left side of water supply pipe b.

[0012] Preferably, the heat exchanger further includes a shell, heat exchange tubes, and a heat exchange perforated plate. The heat exchange tubes are spirally arranged inside the shell. The upper inlet of the heat exchange tubes is connected to the outlet pipe of the induced draft fan, and the lower outlet of the heat exchange tubes is connected to the air box through a pipe. The heat exchange perforated plate is arranged on the side of the heat exchange tubes.

[0013] Preferably, the right side of the bellows is provided with an air outlet pipe a and an air outlet pipe b, and the air outlet pipe a is located on the left side of the air outlet pipe b.

[0014] Preferably, a condensate pipe is provided below the shell, and the right outlet of the condensate pipe is connected to the left side of the steam connection pipe.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] The device is equipped with a water outlet system that automatically regulates water temperature, distributes warm water, and promptly delivers it to the water-using equipment. It also incorporates a wind-powered heat exchanger to enhance waste heat recovery, thus reducing the flow rate of recovered steam waste heat and improving the device's overall waste heat recovery efficiency. A linkage between the condensate and steam connection pipes is implemented, with the steam connection pipe positioned on the left side of the spray cooling device. This allows condensate to automatically flow back into the spray cooling device, preventing steam from entering from below and causing condensate to accumulate at the bottom of the pipes. Separating the condensate and steam processing improves the device's operating efficiency. Two inlet pipes, A and B, allow raw water to enter the spray cooling device through separate pipes for waste heat recovery, increasing the temperature difference between the cooling water and steam in the two heat exchange steps and further enhancing heat exchange efficiency. Attached Figure Description

[0017] Figure 1 This is an isometric view of the present invention;

[0018] Figure 2 This is a front view of the present invention;

[0019] Figure 3 yes Figure 2 A sectional view of section a.

[0020] Figure 4 yes Figure 2 A sectional view of section b in the middle;

[0021] The attached diagram lists the components represented by each number as follows:

[0022] 1. Main body of the device; 2. Air inlet pipe; 3. Heat exchanger; 4. Air box; 5. Steam connection pipe; 6. Heat exchange coil; 7. Diverter plate; 8. Water inlet pipe a; 9. Water inlet pipe b; 10. Spraying mechanism; 11. Water outlet pipe a; 12. Water outlet pipe b; 13. Water pump; 14. Liquid level gauge a; 15. Insulated water tank; 16. Temperature sensor; 17. Liquid level gauge b; 18. Electric valve a; 19. Electric valve b; 20. Water supply pipe a; 21. Water supply pipe b; 22. Shell; 23. Heat exchange tube; 24. Heat exchange orifice plate; 25. Condensate pipe; 26. Air outlet pipe a; 27. Air outlet pipe b; 28. Steam inlet pipe. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] like Figures 1 to 4 As shown, the prior art in this embodiment has the following problems: The inventors have found the following defects in the prior art: 1. The device uses the waste heat of steam to heat the circulating water to achieve the effect of waste heat recovery. However, in actual production, the amount of steam produced by the cardboard production is much greater than the amount of circulating water supplied. This results in a large amount of circulating water being stored in the pipes and water tank after the waste heat is recovered, causing a waste of heat. 2. The recovered steam contains high-temperature condensate. Without the separation and recovery of steam and condensate, it will accumulate at the bottom of the pipe before entering the recovery tank, resulting in a waste of heat in the condensate and a reduction in the efficiency of the recovery device. 3. The temperature of the warm water after the cold water condenses is greater than the temperature before condensation. This further reduces the temperature difference between the warm water and the released steam, resulting in a lower heat exchange efficiency through the coil heat exchange. This means that the remaining heat in the steam cannot be completely recovered, leading to a reduction in the thermal efficiency of the device.

[0025] Therefore, the inventor provides a high-temperature steam waste heat utilization mechanism for a cardboard production line, including a spray cooling device, a wind-powered heat exchange device, and a steam inlet pipe 28. The wind-powered heat exchange device is connected to the right side of the steam inlet pipe 28 via a pipe, and the spray cooling device is connected to the right side of the wind-powered heat exchange device via a pipe. The spray cooling device also includes a device body 1, a water inlet pipe, and a water outlet system. The water inlet pipe is located on the left side of the device body 1, and the water outlet system is located on the right side of the device body 1. The wind-powered heat exchange device also includes an air inlet pipe 2, a heat exchanger 3, a wind box 4, and a steam connection pipe 5. The heat exchanger 3 is connected to the right side of the steam inlet pipe 28 via a pipe. The air inlet pipe 2 is located behind the heat exchanger 3. The wind box 4 is connected to the front side of the heat exchanger 3 via a pipe. The steam connection pipe 5 is located between the right outlet of the heat exchanger 3 and the left inlet of the spray cooling device, and the steam connection pipe 5 is inclined to the right.

[0026] Using the above method, when steam enters the device through the steam inlet pipe, it first passes through the heat exchanger 3 to heat the cold air. The heated cold air then enters the air box 4 as hot air. The pre-treated steam enters the spray cooling device from the side through the steam connection pipe 5. After two heat exchanges, it is discharged from the top of the spray cooling device. The raw water passes through the water inlet pipe and the warm water generated after heat exchange in the spray cooling device is automatically mixed and distributed to each water-using device by the water outlet system according to the temperature.

[0027] Furthermore, a perforated flow divider 7 is provided between the heat exchange coil 6 inside the device body 1 and the inlet of the steam connection pipe 5.

[0028] The diversion plate 7 is used to evenly distribute the steam entering the device body 1 from the steam connection pipe 5 and then discharge it upwards, thereby improving the heat exchange effect between the steam and the heat exchange coil 6 and the spray water.

[0029] Furthermore, the water inlet pipeline also includes water inlet pipe a8 and water inlet pipe b9. Water inlet pipe a8 is located on the left side of the device body 1 and is connected to the inlet of the heat exchange coil 6 in the device body 1. Water inlet pipe b9 is located above the device body 1 and is connected to the inlet of the spray mechanism 10 in the device body 1.

[0030] Among them, the water inlet pipe a8 is used to provide raw water to the heat exchange coil 6 as the first step of heat exchange in the spray cooling device, and the water inlet pipe b9 is used to provide raw water to the spray mechanism 10 as the second step of heat exchange. After the steam entering the device body 1 undergoes two heat exchange steps, the residual heat is recovered into the warm water below the device body 1. Since the raw water temperature is the same in the two heat exchange processes, the temperature difference between the cooling water and the steam in the two heat exchange steps is increased, the residual heat recovery effect is good, and the heat exchange efficiency of the device is improved.

[0031] Furthermore, the water outlet system also includes outlet pipe a11, outlet pipe b12, water pump 13, level gauge a14, insulated water tank 15, temperature sensor 16, level gauge b17, electric valve a18, and electric valve b19. The insulated water tank 15 is located on the right side of the spray cooling device. Outlet pipe a11 is located between the right outlet of the heat exchange coil 6 of the device body 1 and the left inlet of the insulated water tank 15. Outlet pipe b12 is located between the lower right outlet of the device body 1 and the left inlet of the insulated water tank 15. Water pump 13 is installed on the outlet pipe b12, level gauge a14 is installed on the lower front side of the device body 1, temperature sensor 16 is installed on the front side of the insulated water tank 15, level gauge b17 is installed on the right side of temperature sensor 16, electric valve a18 is installed on the left side of water pump 13, and electric valve b19 is installed on the outlet pipe b12. Temperature sensor 16, level gauge a14, level gauge b17, electric valve a18, and electric valve b19 are respectively connected to the control room of the production workshop by telecommunications.

[0032] During operation, the warm water after heat exchange in the spray cooling device accumulates at the bottom of the device body 1 and inside the heat exchange coil 6. The warm water in the device body 1 is drawn out by the water pump 13 and flows through the outlet pipe a11 into the insulated water tank 15. The warm water in the heat exchange coil 6 enters the insulated water tank 15 through the outlet pipe b12. The level gauge a14 is used to detect that the liquid level in the device body 1 does not exceed the inlet position of the steam connection pipe 5 on the side. The level gauge b17 and the temperature sensor 16 detect the liquid level and temperature signal in the insulated water tank 15, respectively, and control the water pump 13, electric valve a18, and electric valve b19 to draw out warm water of different temperatures from the outlet pipe a11 and the outlet pipe b12 and mix them into the insulated water tank 15 to provide a suitable temperature for subsequent water-using equipment.

[0033] Furthermore, the right side of the insulated water tank 15 is provided with a water supply pipe a20 and a water supply pipe b21, with the water supply pipe a20 located to the left of the water supply pipe b21;

[0034] In this system, after the water outlet system adjusts the warm water in the insulated water tank 15 to a suitable temperature, it is transported to the boiler circulating water pipeline through the water supply pipe a20 to heat the boiler inlet water temperature. The water supply pipe b21 can be connected to the cardboard gluing equipment to keep the melted glue warm. With the automatic adjustment of the water outlet system, the device can deliver the warm water generated by the recovery of waste heat to the water-using equipment in a timely manner, preventing the accumulation of warm water and heat loss.

[0035] Furthermore, the heat exchanger 3 also includes a shell 22, a heat exchange tube 23, and a heat exchange orifice plate 24. The heat exchange tube 23 is spirally arranged inside the shell 22. The upper inlet of the heat exchange tube 23 is connected to the outlet pipe of the induced draft fan (not shown in the figure), and the lower outlet of the heat exchange tube 23 is connected to the air box 4 through a pipe. The heat exchange orifice plate 24 is arranged on the side of the heat exchange tube 23.

[0036] Steam enters the interior of the heat exchanger 3 shell 22 through the steam inlet pipe 28, purging the heat exchange orifice plate 24 and heat exchange tube 23 to heat the air inside the heat exchange tube 23 and convert it into hot air. The hot air inside the heat exchange tube 23 enters the air box 4 and is supplied to the air-using equipment. The heat exchange orifice plate 24 increases the contact area between the heat exchange tube 23 and the steam, thus improving the heat exchange effect.

[0037] Furthermore, a condensate pipe 25 is provided below the housing 22, and the right outlet of the condensate pipe 25 is connected to the left side of the steam connection pipe 5;

[0038] During the process of heating air in heat exchanger 3, water vapor in the steam will generate a large amount of condensate when it encounters cold. This condensate is transported to steam connection pipe 5 through condensate pipe 25. Since steam connection pipe 5 is set to the right, the condensate in heat exchanger 3 and the condensate inside steam connection pipe 5 can be transported to spray cooling device for reuse, preventing heat waste in steam condensate and improving the thermal efficiency of the device.

[0039] Furthermore, an air outlet pipe a26 and an air outlet pipe b27 are provided on the right side of the air box 4, and the air outlet pipe a26 is located on the left side of the air outlet pipe b27.

[0040] Among them, air outlet pipe a26 is used to transport hot air in the pipeline to the cardboard drying equipment, and air outlet pipe b27 is used to supply hot air to the air inlet of the boiler burner to increase the inlet temperature and increase the thermal efficiency of the burner. By heating the air to provide hot air, the waste heat in the steam is recovered and utilized, which further improves the efficiency of the device in recovering waste heat from the steam.

[0041] In summary, this device is equipped with a water outlet system that can automatically regulate water temperature, distribute warm water, and promptly deliver warm water to the water-using equipment. It also incorporates a wind-powered heat exchanger to increase the waste heat recovery step, sharing the flow of recovered steam waste heat while improving the device's waste heat recovery efficiency. A condensate pipe 25 is linked to the steam connection pipe, which is positioned on the left side of the spray cooling device, allowing condensate to automatically flow back into the spray cooling device. This prevents steam from entering from below and causing condensate to accumulate at the bottom of the pipe, separating condensate and steam for processing and improving the device's operating efficiency. Furthermore, inlet pipes a8 and b9 allow raw water to enter the spray cooling device from two separate pipes to recover waste heat, increasing the temperature difference between the cooling water and steam in the two heat exchange steps and improving heat exchange efficiency.

[0042] The working principle of this utility model:

[0043] When steam enters the device through the steam inlet pipe, it enters the interior of the heat exchanger 3 shell 22, purging the heat exchange orifice plate 24 and heat exchange tube 23, heating the air inside the heat exchange tube 23 and converting it into hot air. The hot air inside the heat exchange tube 23 enters the air box 4 and is delivered to the cardboard drying equipment through the air outlet pipe a26 and the air outlet pipe b27, respectively, to the air inlet of the boiler burner to increase the inlet temperature and increase the thermal efficiency of the burner. By heating the air to provide hot air, the waste heat in the steam is recovered and utilized, further improving the efficiency of the device in recovering waste heat from steam.

[0044] After preliminary treatment, the steam enters the spray cooling device from the side through the steam connection pipe 5. The diverter plate 7 is used to evenly distribute the steam entering the device body 1 through the steam connection pipe 5 and then discharge it upwards. The steam undergoes two-step heat exchange by passing through the heat exchange coil 6 and the spray water. The water inlet pipe a8 is used to provide raw water to the heat exchange coil 6 as the first step of heat exchange in the spray cooling device. The water inlet pipe b9 is used to provide raw water to the spray mechanism 10 as the second step of heat exchange. After the steam entering the device body 1 undergoes two-step heat exchange, the residual heat is recovered into the warm water below the device body 1. Since the raw water temperature is the same in both heat exchange processes, the temperature difference between the cooling water and the steam in the two heat exchange steps is increased, resulting in good residual heat recovery and improved heat exchange efficiency of the device.

[0045] The steam after heat exchange is discharged from the pipe above the spray cooling device;

[0046] During the process of heating air in heat exchanger 3, the water vapor in the steam will generate a large amount of condensate when it encounters cold. This condensate is transported to steam connection pipe 5 through condensate pipe 25. Since steam connection pipe 5 is set to the right, the condensate in heat exchanger 3 and the condensate inside steam connection pipe 5 can be transported to spray cooling device for reuse, preventing the heat in steam condensate from being wasted and improving the thermal efficiency of the device.

[0047] During operation, the warm water after heat exchange in the spray cooling device accumulates at the bottom of the device body 1 and inside the heat exchange coil 6. The warm water in the device body 1 is drawn out by the water pump 13 and flows through the outlet pipe a11 to the insulated water tank 15. The warm water in the heat exchange coil 6 enters the insulated water tank 15 through the outlet pipe b12. The level gauge a14 is used to detect that the liquid level in the device body 1 does not exceed the inlet position of the steam connection pipe 5 on the side. The level gauge b17 and the temperature sensor 16 detect the liquid level and temperature signal in the insulated water tank 15, and control the water pump 13, electric valve a18, and electric valve b19 to draw out warm water of different temperatures from the outlet pipe a11 and the outlet pipe b12 and mix them into the insulated water tank 15. This provides a suitable temperature for the subsequent water-using equipment, so that the device can deliver the warm water generated by the recovery of waste heat to the water-using equipment in a timely manner and prevent the accumulation of warm water from causing heat loss.

[0048] This concludes the description of the operating principle of the device.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-temperature steam waste heat utilization mechanism on a paperboard production line, comprising a spray cooling device, a wind heat exchange device, and a steam inlet pipeline (28), the wind heat exchange device is connected to the right side of the steam inlet pipeline (28) through a pipeline, and the spray cooling device is connected to the right side of the wind heat exchange device through a pipeline, characterized in that: The spraying cooling device further comprises a device body (1), a water inlet pipeline and a water outlet system, the water inlet pipeline is arranged at the left side of the device body (1), and the water outlet system is arranged at the right side of the device body (1); the wind heat exchange device further comprises a wind inlet pipeline (2), a heat exchanger (3), a wind box (4) and a steam connection pipeline (5), the heat exchanger (3) is connected at the right side of the steam inlet pipeline (28) through a pipeline, the wind inlet pipeline (2) is arranged at the rear side of the heat exchanger (3), the wind box (4) is connected at the front side of the heat exchanger (3) through a pipeline, the steam connection pipeline (5) is arranged between the right side outlet of the heat exchanger (3) and the left side inlet of the spraying cooling device and is arranged to be inclined to the right.

2. A high-temperature steam waste heat utilization mechanism on a paperboard production line according to claim 1, characterized in that: A split flow plate (7) with holes is arranged between the heat exchange coil (6) in the device body (1) and the inlet of the steam connection pipeline (5).

3. A high temperature steam waste heat utilization mechanism on a paperboard production line according to claim 1, characterized in that: The water inlet pipeline further comprises a water inlet pipe a (8) and a water inlet pipe b (9), the water inlet pipe a (8) is arranged at the left side of the device body (1) and is connected to the inlet of the heat exchange coil (6) in the device body (1), and the water inlet pipe b (9) is arranged above the device body (1) and is connected to the inlet of the spraying mechanism (10) in the device body (1).

4. A high-temperature steam waste heat utilization mechanism on a paperboard production line according to claim 1, characterized in that: The water outlet system further comprises a water outlet pipe a (11), a water outlet pipe b (12), a water pump (13), a liquid level meter a (14), a heat preservation water tank (15), a temperature sensor (16), a liquid level meter b (17), an electric valve a (18) and an electric valve b (19), the heat preservation water tank (15) is arranged at the right side of the spraying cooling device, the water outlet pipe a (11) is arranged between the right side outlet of the heat exchange coil (6) of the device body (1) and the left side inlet of the heat preservation water tank (15), the water outlet pipe b (12) is arranged between the right side lower outlet of the device body (1) and the left side inlet of the heat preservation water tank (15), the water pump (13) is arranged on the pipeline of the water outlet pipe b (12), the liquid level meter a (14) is arranged below the front side of the device body (1), the temperature sensor (16) is arranged at the front side of the heat preservation water tank (15), the liquid level meter b (17) is arranged at the right side of the temperature sensor (16), the electric valve a (18) is arranged on the pipeline at the left side of the water pump (13), and the electric valve b (19) is arranged on the pipeline of the water outlet pipe b (12), and the temperature sensor (16), the liquid level meter a (14), the liquid level meter b (17), the electric valve a (18) and the electric valve b (19) are respectively connected to the control room of the production workshop through electric signals.

5. A high temperature steam waste heat utilization mechanism in a paperboard production line according to claim 4, characterized in that: A water supply pipe a (20) and a water supply pipe b (21) are arranged at the right side of the heat preservation water tank (15).

6. A high temperature steam waste heat utilization mechanism on a paperboard production line according to claim 1, characterized in that: The heat exchanger (3) further comprises a shell (22), a heat exchange pipe (23) and a heat exchange hole plate (24), the heat exchange pipe (23) is spirally arranged in the inner side of the shell (22), the upper end inlet of the heat exchange pipe (23) is connected with the outlet pipeline of the induced draft fan, the lower end outlet of the heat exchange pipe (23) is connected with the wind box (4) through a pipeline, and the heat exchange hole plate (24) is arranged on the side surface of the heat exchange pipe (23).

7. A high temperature steam waste heat utilization mechanism on a paperboard production line according to claim 6, characterized in that: The shell (22) is provided below with a condensate water pipeline (25), and the right side outlet of the condensate water pipeline (25) is connected to the left side of the steam connecting pipeline (5).

8. A high temperature steam waste heat utilization mechanism on a paperboard production line according to claim 1, characterized in that: The right side of the wind box (4) is provided with an air outlet pipe a (26) and an air outlet pipe b (27), and the air outlet pipe a (26) is arranged at the left side of the air outlet pipe b (27).

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